Seminal information on the creation of the communications era. Chemical research and research of methods all directed toward the advance of the telephone and other contractual enterprises. Mankind has needed the publication of these for a long long time. 1-1 the famous Housekeeper seal for annealing glass and copper. High power communications starting with the their improvement of the deForest vacuum tube.

Thanks to Bell Labs for uploading the Bell System Technical Journal articles to Internet Archive!

http://archive.org/details/bstj-archives